裏暦, a calendar for finding the days your gates open

Field notes

裏暦 separates nine source systems before combining them into readings across seven areas, including work, romance, money, and fate. Its “gate” dates appear only when the 天・地・身 divisions all open, reportedly about twice a year. The site says astronomical positions are calculated directly, citing a 0.006-degree error at the 2026 spring equinox, while birth dates remain stored on the user’s device. More elaborate action guidance and relationship interpretation are identified as planned paid features.